CDL general knowledge practice test 13

C: Stop a safe distance from the scene, wait for police and report what you saw. Stop a safe distance from the crash scene, wait for police and report the driving behavior you witnessed. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.10.3 What you should do when confronted by an aggressive driver, page 70.

A: Keeps the wheels from locking up during hard braking. ABS is a computerized system that keeps wheels from locking during hard brake applications; it doesn't increase or decrease normal braking capability. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.18 Antilock braking systems (ABS), page 87.

B: March 1, 1997. ABS is required on air-brake truck tractors built on or after March 1, 1997; other air-brake vehicles from March 1, 1998; and hydraulic-brake trucks and buses from March 1, 1999. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.18.2 Vehicles required to have antilock braking systems, page 88.

C: March 1, 1999. Hydraulically braked trucks and buses in the weight range covered by the rule must have ABS if built on or after March 1, 1999. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.18.2 Vehicles required to have antilock braking systems, page 88.

B: On the left side, at the front or rear corner. A trailer's yellow ABS malfunction lamp is mounted on its left side, at either the front or the rear corner. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.18.3 How to know if your vehicle is equipped with ABS, page 88.

A: Until you are driving over 5 mph. Newer ABS lamps light briefly at start-up as a bulb check; on older systems the lamp may stay lit until you pass 5 mph. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.18.3 How to know if your vehicle is equipped with ABS, page 88.

D: Brake normally, watch the trailer, and let up on the brakes if it begins to swing out (when safe). With ABS only on the tractor you keep steering control and are less likely to jackknife, but watch the trailer and ease off the brakes if it starts to swing out. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.18.5 ABS on the tractor only or only on the trailer, page 88.

C: When you drive a straight truck or combination with working ABS on all axles. The only exception to braking normally is a straight truck or combination with working ABS on all axles, where you can fully apply the brakes in an emergency. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.18.6 Braking with ABS, page 89.

B: You still have regular brakes; drive normally and get the ABS serviced soon. If the lamp stays on or comes on while driving, you may have lost ABS on one or more wheels, but you still have normal brakes. Get the system serviced soon. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.18.7 Braking if ABS is not working, page 89.

A: ABS won't prevent power or turning skids. ABS should prevent brake-induced skids, but not skids from spinning drive wheels or going too fast in a turn; it also won't make up for bad brakes. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.18.8 Safety reminders, page 89.

C: You must not drive, except in an emergency to the nearest place where you can safely stop. If illness makes you unable to drive safely, don't drive. In an emergency you may go only as far as the nearest place where you can stop safely. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 2.22.3 Illness, page 95.

C: The driver. Even when someone else loads the cargo, the driver must inspect it, spot overloads and poor balance, and make sure it is properly secured. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: Section 3: Transporting Cargo Safely, page 98.

B: It doesn't block your view ahead or to the sides, or your access to emergency equipment. You must know the cargo doesn't obscure your view ahead or to the sides and doesn't restrict access to emergency equipment. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: Section 3: Transporting Cargo Safely, page 98.

A: After every break you take during driving. Re-inspect after you have driven 3 hours or 150 miles and after every break you take during driving. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 3.1 Inspecting cargo, page 98.

D: The value the manufacturer specifies as the loaded weight of a single vehicle. GVWR is the loaded weight the manufacturer specifies for a single vehicle. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 3.2.1 Definitions you should know, page 98.

C: The weight transmitted to the ground by one axle or one set of axles. Axle weight is how much weight one axle, or one group of axles, puts on the road. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 3.2.1 Definitions you should know, page 99.

B: On the side of each tire. Each tire's sidewall shows its load rating: the most weight it can safely carry at a given inflation pressure. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 3.2.1 Definitions you should know, page 99.

A: Permits less maximum axle weight for axles that are closer together. A bridge formula allows less maximum axle weight for axles closer together, to prevent overloading bridges and roadways. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 3.2.2 Legal weight limits, page 99.

D: Brakes can fail when forced to work too hard, and stopping distance increases. Overloading hurts steering, braking and speed control; stopping distance increases and brakes can fail when overworked. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 3.2.2 Legal weight limits, page 99.

C: In bad weather or in mountains. Legal maximum weights may still be unsafe in mountains or bad weather, so allow for that before you drive. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 3.2.2 Legal weight limits, page 99.

B: Put the heaviest parts of the cargo under the lightest parts. Distribute cargo so it is as low as possible, with the heaviest parts under the lightest parts. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 3.2 Weight and balance (Don't be top heavy), page 99.

A: The steering axle may be too light to steer safely. Too little weight on the steering axle, usually from loading too far to the rear, can leave too little weight to steer safely. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 3.2.4 Balance the weight, page 99.

D: Poor traction, so the drive wheels may spin easily. Too little weight on the driving axles causes poor traction; the drive wheels may spin and in bad weather the truck may not keep going. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 3.2.4 Balance the weight, page 99.

C: Hard steering and damage to the steering axle and tires. Too much weight on the steering axle can cause hard steering and damage the steering axle and tires. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 3.2.4 Balance the weight, page 99.

B: Blocking fits snugly against the front, back or sides of cargo to keep it from sliding; bracing runs from the upper part of the cargo to the floor or walls. Blocking sits tight against the front, back or sides of the cargo and is fastened to the deck. Bracing runs from high on the cargo down to the floor or walls. Wisconsin Commercial Driver's Manual (BDS356), based on the AAMVA 2025 CDL Manual: 3.3.1 Blocking and bracing, page 100.